Account and Package Hook in WHM

I am looking for a hook for the event of update for account/package, and package upgrade, for WHM.
The closest type of hook I find is script hook, but I do not see any hook for the related events other than account creation.

I turned to the sample CustomEventHandler to check for APIs called during the events mentioned.
And turns out that not even EvenHandler is called (I placed a STDERR print in EvenHandler__Init() ).